Watch a full golf swing and it looks like there is a lot of arm movement. Not only does there appear to be a lot of arm movement, but it also appears your shoulders require a swimmer’s degree of flexibility to make a correct golf swing.
It’s all very deceptive because in relation to your body, your arms really don’t move much.
This video explains the range. At address your arms are a little forward of your body’s midline. At the top of your backswing they have lifted and moved just right of your body’s midline. At impact they haven’t even returned to where they were at address.
If you are unsure about this, then copy my movements in the video to see for yourself. Your golf swing will love you for copying these positions.